10.25.3. Service Information 
- DSS 1 terminals should always be configured for the VOICE&FAX & DATA services.
- If a busy DSS1 terminal is called by a system terminal, the ringing tone is injected first, followed by the busy tone.
- The COS of the terminals must include the MULTRA parameter. Otherwise, the new services cannot be used.
- Calls on hold are released when the holding party goes on-hook. There is no recall.
- A separate buffer for FWD must be generated in DIMSU AMO. Dimension the buffer as follows: number of DSS1 terminals x 3.
- In ZAND AMO, the OPTLOAD table must be adjusted (development).
- The maximum number of callbacks is set in SBCSU AMO.
- New COS are implemented in AMO COSSU.
- If the MULTRA parameter is set, a DSS1 terminal can no longer be used in a hunting group.
- The secretary function is not implemented.
- Changes to the AMO surface.
- COSSU parameters for CCBS and Call Waiting.
- New branch for FWDDSS1 (AMO ZIEL).
- Transfer by release is not possible (separate function).
- Callback from a system terminal is possible with restrictions.
- COLR to a system terminal is not possible.
- DSS1 terminal can call itself: no
- If on a Profiset50 a 4-digit number is displayed without a name, the first digit disappears after a brief period of time.
- The feature groupcall in AUN-Group is not possible for DSS1 terminals.
- DSS1 terminals cannot dial the code for PSE (paging equipment)